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An urn contains 15 black marbles, green marbles, and red marbles, all
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18 Jun 2021, 01:29
18 Jun 2021, 01:29
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Question Stats:
95% (00:52) correct
4% (03:22) wrong based on 21 sessions
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An urn contains 15 black marbles, green marbles, and red marbles, all identical except for color. If the number of green marbles is 5, what is the probability of drawing a black or red marble when a single marble is drawn at random from the urn?
Express your answer as a fraction.
Express your answer as a fraction.
Show: :: OA
2/3
Re: An urn contains 15 black marbles, green marbles, and red marbles, all
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18 Jun 2021, 02:00
18 Jun 2021, 02:00
There are total 15 marbles of which 5 are green, hence 10 are black and red combined.
Probability of drawing a black or red marble
= (total of black and red marble) / (total marbles)
= (10 / 15)
Ans : 2/3
Probability of drawing a black or red marble
= (total of black and red marble) / (total marbles)
= (10 / 15)
Ans : 2/3
gmatclubot
Re: An urn contains 15 black marbles, green marbles, and red marbles, all [#permalink]
18 Jun 2021, 02:00
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